{
  "id": "1709.08779",
  "version": "v1",
  "published": "2017-09-26T01:34:19.000Z",
  "updated": "2017-09-26T01:34:19.000Z",
  "title": "Two-Dimensional Molecular Gas and ongoing star formation around H II region Sh2-104",
  "authors": [
    "Jin-Long Xu",
    "Ye Xu",
    "Naiping Yu",
    "Chuan-peng Zhang",
    "Xiao-Lan Liu",
    "Jun-Jie Wang",
    "Chang-Chun Ning",
    "Bing-Gang Ju",
    "Guo-Yin Zhang"
  ],
  "comment": "19 pages, 14 figures, Accepted for publication in ApJ",
  "categories": [
    "astro-ph.SR",
    "astro-ph.GA"
  ],
  "abstract": "We performed a multiwavelength study towards HII region Sh2-104. New maps of 12CO J=1-0 and 13CO J=1-0 were obtained from the Purple Mountain Observatory (PMO) 13.7 m radio telescope. Sh2-104 displays a double-ring structure. The outer ring with a radius of 4.4 pc is dominated by 12 um, 500 um, 12CO J=1-0, and 13CO J=1-0 emission, while the inner ring with a radius of 2.9 pc is dominated by 22 um and 21 cm emission. We did not detect CO emission inside the outer ring. The north-east portion of the outer ring is blueshifted, while the south-west portion is redshifted. The present observations have provided evidence that the collected outer ring around Sh2-104 is a two-dimensional structure. From the column density map constructed by the Hi-GAL survey data, we extract 21 clumps. About 90\\% of all the clumps will form low-mass stars. A power-law fit to the clumps yields M=281Msun(r/pc)^1.31. The selected YSOs are associated with the collected material on the edge of Sh2-104. The derived dynamical age of Sh2-104 is 1.6*10^6 yr. Compared the Sh2-104 dynamical age with the YSOs timescale and the fragmentation time of the molecular ring, we further confirm that collect-and-collapse process operates in this region, indicating a positive feedback from a massive star for surrounding gas.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2017-09-26T01:34:19.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "two-dimensional molecular gas",
      "ongoing star formation",
      "outer ring",
      "purple mountain observatory",
      "collect-and-collapse process operates"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 19,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}